介绍化肥装置中一种单吸式安全阀的作用、功能和密封结构，分析其工作中产生泄漏的原因，并对单吸阀的结构进行改进。
Presents the role, function and seal structure of a kind of single-suction safety valve, analyzes the reasons for the leak and improves its structure.
进口卫生泵的型为单级、单吸、全封闭不锈钢离心泵或者气动隔膜阀。
Sanitary pump is single stage, single suction, full closed stainless steel centrifugal pump or pneumatic diaphragm valve.
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